It doesn't take a lot to give a watch plenty of nerd appeal. The Wall Switch Watch is a fine example of this train of thought. It's a watch you click like a switch, and that alone makes it geeky enough to be interesting.
As you've no doubt surmised, the watch doesn't have a lot of features. One click shows you the time; toggling the switch will show you the date. The minimalistic presentation is rounded out with a few little animated flourishes, which you can see in the video below.
Watchismo's Wall Switch Watch usually runs for $150, but is currently discounted for its launch at $100.